A bird’s crest is made up of a slender array of feathers on top of their head. These feathers are a bit longer and can be spiked up or slicked back, depending on what the bird is trying to communicate. Even birds without crests, like crows or sparrows, sometimes puff up their short crown feathers.

More info and transcript at BirdNote.org.

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What Are Birds Saying with Their Crests?